Mengshi Zhou , Zhentao Fu , Jin Li , Chunxiao Zhang , Chaoyu He , Tao Ouyang , Chao Tang , Jianxin Zhong
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引用次数: 0
Abstract
Two-dimensional Janus nanomaterials have been demonstrated great potentail applications in high-performance multifunctional devices due to their asymmetric structural characteristics. In this study, we propose a monolayer Janus γ-Ge2STe and have studied its electronic, transport, optical, and piezoelectric properties by first-principles calculations. The results show that the Janus structure γ-Ge2STe is an indirect bandgap semiconductor with intrinsic 'Mexican hat' energy band dispersion pattern and possesses excellent optical performance with high absorbance and photocurrent. Due to the intrinsic electric dipole and suitable band edges, γ-Ge2STe exhibits strong solar hydrogen production efficiency (ηSTH = 20.39 %), which can also be enhanced to 24.48 % by the in-plane tensile strain effectively. Remarkably, owing to the breaking of inversion symmetry, γ-Ge2STe reveals a strong piezoelectric response (d11 = 14.02 pm/V) under the piezoelectric stress-strain coefficient. The diverse characteristics of monolayer Janus γ-Ge2STe, coupled with its overall stability (thermal, dynamic, and mechanical), highlight its potential multifunctional applications in catalysts, nanoelectronics, photovoltaics, and piezoelectrics.
期刊介绍：
Physica E: Low-dimensional systems and nanostructures contains papers and invited review articles on the fundamental and applied aspects of physics in low-dimensional electron systems, in semiconductor heterostructures, oxide interfaces, quantum wells and superlattices, quantum wires and dots, novel quantum states of matter such as topological insulators, and Weyl semimetals.
Both theoretical and experimental contributions are invited. Topics suitable for publication in this journal include spin related phenomena, optical and transport properties, many-body effects, integer and fractional quantum Hall effects, quantum spin Hall effect, single electron effects and devices, Majorana fermions, and other novel phenomena.
Keywords:
• topological insulators/superconductors, majorana fermions, Wyel semimetals;
• quantum and neuromorphic computing/quantum information physics and devices based on low dimensional systems;
• layered superconductivity, low dimensional systems with superconducting proximity effect;
• 2D materials such as transition metal dichalcogenides;
• oxide heterostructures including ZnO, SrTiO3 etc;
• carbon nanostructures (graphene, carbon nanotubes, diamond NV center, etc.)
• quantum wells and superlattices;
• quantum Hall effect, quantum spin Hall effect, quantum anomalous Hall effect;
• optical- and phonons-related phenomena;
• magnetic-semiconductor structures;
• charge/spin-, magnon-, skyrmion-, Cooper pair- and majorana fermion- transport and tunneling;
• ultra-fast nonlinear optical phenomena;
• novel devices and applications (such as high performance sensor, solar cell, etc);
• novel growth and fabrication techniques for nanostructures
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